>Clean up your lines, they're too shaky.
>Work on how you draw the body. Exxagerated proportions are fine, but yours are a bit sloppy and uneven.
>Thicken the borders around characters and objects, it helps define them and makes it more appealing.
>Ears...enough said
>The arms are offputting. Hinged or noodly, pick one and stick with it
>Other than those things, it's pretty good.

You can do something about the lines quite easily. Download paint tool SAI (you get a month free trial). There's a curve line tool that allows for very smooth and consistent linework, even with a mouse